Some years ago there was a ninja themed celebration, but that went largely unnoticed.
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BartDec 19 '12 at 21:06

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Then there was the robot gala (scrapped partway through due to technical complications), the zombie event (somewhat monotonous, but hard to give up once you were into it), and the pirate party (to this day, no one knows where the prizes went).
–
Josh CaswellDec 19 '12 at 21:21

1 Answer
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Depends on what you mean, but you can check out the Stack Exchange promotion archive for cool events that have happened in the past. Winter Bash is just an extension of Arqade's Hat Dash from last year, for example.